Respuesta :

dsentone2021

Answer: 25

Step-by-step explanation:

21 + 18 +16 + X = 20×4

55 + X = 80

X = 80- 55

Mala388

Answer:

21.75

Step-by-step explanation:

21- 16 = 5

5/2 2.5

16 + 2.5 or 21 - 2.5

18.5 - 18 = .5

1/2 times 1/2 =

1/4

1/4 = .25

18.5 - .25 or 18 + .25

18.25

20 - 18.25 = 1.75

1.75 + 20

21.75

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